body{min-width:350px}.card{width:25%}@media only screen and (width<=1700px){.card{width:40%}}@media only screen and (width<=1200px){.card{width:50%}}@media only screen and (width<=900px){.card{width:70%}}@media only screen and (width<=512px){.card{width:100%;margin:5px}.card-body{padding:.5rem}}